body {
  font-family: 'Segoe UI', sans-serif;
  background-color: #fdfaf6;
  color: #333;
  padding: 20px;
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  align-items: center;
}

h1 {
  font-family: 'Georgia', serif;
  font-size: 2em;
  color: #4a4a4a;
}

.info-box {
  background-color: #f7f7d5;
  border-left: 5px solid #d5dd7b;
  padding: 15px;
  margin-bottom: 20px;
  max-width: 800px;
  width: 100%;
}

.button-group {
  text-align: center;
  margin-bottom: 20px;
}

.button-group button {
  margin: 5px;
  padding: 10px 15px;
  background-color: #a0aa42;
  color: rgb(255, 255, 255);
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

.button-group button:hover {
  background-color: #d3c82c;
}

.preposition-list {
  max-width: 800px;
  width: 100%;
  text-align: center;
}

.preposition-item {
  margin-bottom: 30px;
  display: flex;
  flex-direction: row;
  font-size: 24px;
}

.preposition-item img {
  max-width: 300px;
  border-radius: 8px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}
.preposition-item p{
  margin-left: 20px;
}
.highlight {
  font-weight: bold;
  color: #3b3b32;
  background-color: #cdf8ea;
  padding: 2px 4px;
  border-radius: 3px;
}

.toeic-top{
    margin-top: 5rem;
    text-align: center;
}
.toeic-top a{
    text-decoration: none;
}
.top-button{
    padding: 10px 15px;
    background-color: #a19f05;
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: background-color 0.3s;
}    
.top-button:hover{
    background-color: #f8f8d1;
    color: #222;
}

footer {
  margin-top: 40px;
  padding: 20px;
  background-color: #dfdfb9;
  text-align: center;
  font-size: 0.95em;
  color: #444;
  width: 100%;
}


@media screen and (max-width:480px){
  body{
    padding: 10px;
  }
  .info-box,
  .word-list,
  footer,
  .button-group{
    max-width: 100%;
    padding: 12px;
    font-size: 0.95em;
  }
  h1{
    font-size: 1.4em;
    line-height: 1.3;
  }
  .button-group{
    flex-direction: column;
    align-items: center;
  }
  .button-group button{
    width: 100%;
    max-width: 300px;
    font-size: 1em;
  }
  .example{
    font-size: 0.9em;
  }
  .highlight{
    padding: 2px 3px;
    font-size: 0.95em;
  }
  footer{
    font-size: 0.85em;
    text-align: center;
  }
}